Omega-3 Fats: Why I'm Rethinking My Fish Oil Recommendations

Fall is my season for deep-dives. 🍂

In my world, life slows down a bit in the fall. It's the season when I dig into topics I'm curious about and take a fresh look at my clinical protocols. Staying current with the science lets me refine my recommendations as new research emerges. This fall, I took a deep dive into omega-3 fats, and it has me rethinking the fish oil recommendations I give my patients.

Omega-3 fats: what they are and why they matter.

Omega-3 fats have come up in my practice since the day I opened it - most often when we talk about heart health and inflammation.

There are three main omega-3s:

ALA (alpha-linolenic acid) - found in flax, chia, and walnuts. Your body converts only a small amount into the more active forms.

EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid) - found mainly in fatty fish like salmon, sardines, mackerel, and anchovies, and in fish oil. These are the omega-3s that do most of the work.

Why they matter: it's about your cell membranes

The fats you eat become part of your cell membranes, and that changes how your cells behave. Inflammatory immune cells are normally rich in arachidonic acid, an omega-6 fat that fuels inflammation. With enough EPA and DHA, these omega-3s gradually replace some of it. The result is fewer inflammatory messengers, plus the raw material for resolvins and other compounds that actively switch inflammation off.

The key takeaway: the benefit of omega-3 fats depends on how much EPA and DHA actually make it into your cell membranes.

The goal: test, don’t guess.

I routinely measure omega-3 levels with the omega-3 index, the percentage of EPA and DHA in your red blood cell membranes. It reflects your average intake over about four months, not just last night's salmon.

Your omega-3 index goal: 8-12%

I used to be happy when a patient's index got above 5%, but I'm raising the bar. An index of 8% or higher is linked to the strongest protection from death due to coronary heart disease, and higher levels are associated with lower inflammatory markers. In the Framingham Offspring cohort, a low index predicted cardiovascular events about as strongly as diabetes, high cholesterol, or smoking.

For the average patient, I'm aiming for 8%; for those with greater inflammation-related concerns (like rheumatoid arthritis), I'm pushing the goal closer to 12%.

Fish Oil: the dose and the form.

For anti-inflammatory benefits, the evidence points to about 2-4 grams a day of combined EPA + DHA, far more than a typical one-a-day capsule. Skip the "1,000 mg fish oil" on the front of the label - add up the EPA and DHA on the back to find your real dose.

Form matters. Triglyceride forms of fish oil (often labeled "TG" or "rTG") is how omega-3s occur naturally in fish. Ethyl ester (EE) is cheaper but absorbed less well. A 2026 meta-analysis found that triglyceride forms lowered CRP, a marker of inflammation, better than ethyl esters. That study was done in dialysis patients, but combined with the absorption data, it's why I now favor the triglyceride form.

Whichever form you choose, take it with a meal that contains fat for best absorption.

The bottom line.

Omega-3s work at the cell level. EPA and DHA replace some of the inflammatory arachidonic acid in your cell membranes and help your body actively resolve inflammation.

• Test, don't guess. The omega-3 index shows your average levels over about four months.

• Aim higher. Aim for a goal of 8-12%, with the upper end for people with inflammation-related conditions.

• Dose matters. Anti-inflammatory benefits typically take about 2-4 grams of combined EPA + DHA a day. Check the back of the label for your real dose.

• Form matters. I favor triglyceride-form fish oil, taken with a meal that contains fat.

This information is educational and isn't meant as personal medical advice. Always talk with your practitioner before starting or increasing an omega-3 supplement. This is especially important if you have a history of atrial fibrillation or palpitations, take a blood thinner, or have surgery coming up.

Are you ready to take a more PROACTIVE approach to your health? I can help! As a board-certified Integrative & Functional Medicine physician and Certified Menopause Specialist, I can help you “think outside of the box and dig deeper with a variety of laboratory testing to help uncover the root causes of your symptoms, and create a plan personalized for you that goes beyond the prescription pad to incorporate diet/lifestyle change, nutritional supplements, holistic therapies, health coaching and more! Contact us to get started!

Sources:

Harris WS, von Schacky C. The Omega-3 Index: a new risk factor for death from coronary heart disease? Prev Med. 2004;39(1):212-220.

Franco WG, O'Keefe EL, O'Keefe JH, Tintle N, Marchioli R, Harris WS. Omega-3 index improves upon the pooled cohort equation in predicting risk for CVD. J Clin Lipidol. 2025.

Calder PC. Omega-3 fatty acids and inflammatory processes. Nutrients. 2010;2(3):355-374.

Calder PC. Long-chain polyunsaturated fatty acids and inflammation. Food Nutr Res. 2006;50(Suppl 2):54-61.

Blair C, et al. Anti-inflammatory effects and safety of omega-3 fatty acids in haemodialysis: a systematic review and meta-analysis. Clin Nutr ESPEN. 2026;102957.

Gencer B, et al. Effect of long-term marine omega-3 fatty acids supplementation on the risk of atrial fibrillation in randomized controlled trials of cardiovascular outcomes. Circulation. 2021.